import config from './../../config.js';
import Dialog_class from './../../libs/popup.js';
import Base_layers_class from './../../core/base-layers.js';
import glfx from './../../libs/glfx.js';
import alertify from './../../../../node_modules/alertifyjs/build/alertify.min.js';

class Effects_vignette_class {

    constructor() {
        this.POP = new Dialog_class();
        this.Base_layers = new Base_layers_class();
        this.fx_filter = false;
    }

    vignette() {
        var _this = this;

        if (config.layer.type != 'image') {
            alertify.error('图层必须是图像，将其转换为栅格来应用此工具。');
            return;
        }

        var settings = {
            title: 'Vignette',
            preview: true,
            effects: true,
            params: [
                { name: "param1", title: "Level:", value: "0.5", range: [0, 1], step: 0.01 },
                { name: "param2", title: "Size:", value: "0.5", range: [0, 1], step: 0.01 },
            ],
            on_change: function(params, canvas_preview, w, h, canvas_) {
                var data = _this.change(canvas_, params);
                canvas_preview.clearRect(0, 0, canvas_.width, canvas_.height);
                canvas_preview.drawImage(data, 0, 0);
            },
            on_finish: function(params) {
                window.State.save();
                _this.save(params);
            },
        };
        this.POP.show(settings);
    }

    save(params) {
        //get canvas from layer
        var canvas = this.Base_layers.convert_layer_to_canvas(null, true);
        var ctx = canvas.getContext("2d");

        //change data
        var data = this.change(canvas, params);
        ctx.clearRect(0, 0, canvas.width, canvas.height);
        ctx.drawImage(data, 0, 0);

        //save
        this.Base_layers.update_layer_image(canvas);
    }

    change(canvas, params) {
        if (this.fx_filter == false) {
            //init glfx lib
            this.fx_filter = glfx.canvas();
        }

        var param1 = parseFloat(params.param1);
        var param2 = parseFloat(params.param2);

        var texture = this.fx_filter.texture(canvas);
        this.fx_filter.draw(texture).vignette(param1, param2).update(); //effect

        return this.fx_filter;
    }

}

export default Effects_vignette_class;